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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Derivative Financial Instruments |  |  |
Notional Amount | $ 21,791,262,000 |  | $ 21,351,715,000
Estimated Fair Value Gain | 413,388,000 |  | 414,742,000
Estimated Fair Value Loss | 412,740,000 |  | 410,137,000
Gain or loss recorded | 41,000 | $ 0 |
Interest Rate Derivatives, at Fair Value, Net | 4,000 |  | 5,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Fair value of forward commitments | (412,168,000) |  | (410,137,000)
Other Liabilities |  |  |
Derivative Financial Instruments |  |  |
Interest Rate Derivative Liabilities, at Fair Value | 409,000,000.0 |  | 408,800,000
Other Assets |  |  |
Derivative Financial Instruments |  |  |
Interest Rate Derivative Assets, at Fair Value | 409,000,000.0 |  | 408,800,000
Mortgage loan pipeline |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Obligation | 263,976,000 |  | 264,000,000
Expected closures |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Obligation | 241,672,000 |  | 233,265,000
Cash flow hedge | Cash and Cash Equivalents | Borrower |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 29,800,000 |  |
Cash flow hedge | Interest-bearing deposits (Liability) | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Cash collateral | 124,800,000 |  |
Interest rate contracts |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 21,400,000,000 |  | 20,800,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 85,000,000.0 |  | 205,000,000.0
Estimated gain (loss) on fair value | (3,100,000) |  | 1,200,000
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 85,000,000 |  | 205,000,000
Estimated Fair Value Gain |  |  | 1,228,000
Estimated Fair Value Loss | 3,084,000 |  |
Mortgage loan pipeline commitments hedging |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Obligation | 256,000 |  | 4,759,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 277,500,000 |  | 324,000,000
Estimated Fair Value Gain | 4,381,000 |  | 4,738,000
Forward commitments |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Obligation | 277,500,000 |  | 324,000,000
Fair value of forward commitments | 4,124,000 |  | (21,000)
Customer swaps | Cash flow hedge | Investment securities - available for sale |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 262,100,000 |  |
Foreign exchange swaps |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | 0 | $ 0 |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 18,100,000 |  | 15,700,000
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 18,078,000 |  | 15,716,000
Estimated Fair Value Loss | 645,000 |  | 1,355,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 10,706,435,000 |  | 10,404,605,000
Estimated Fair Value Gain | 106,122,000 |  | 408,776,000
Estimated Fair Value Loss | 363,248,000 |  | 69,998,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 10,704,249,000 |  | 10,402,394,000
Estimated Fair Value Gain | 302,885,000 |  |
Estimated Fair Value Loss | $ 45,763,000 |  | $ 338,784,000

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